public static async Task <FileFormat> GetAsync(Stream stream)
{
// Get first 16K
stream.Seek(0, SeekOrigin.Begin);
var firstBytes = await FileFormatUtils.ReadBytesAsync(stream, SixteenKilobytes);
// Get last 16K
var lastBytes = firstBytes;
if (stream.Length > SixteenKilobytes)
{
var offset = stream.Length - SixteenKilobytes;
stream.Seek(offset, SeekOrigin.Begin);
lastBytes = await FileFormatUtils.ReadBytesAsync(stream, SixteenKilobytes);
}
// Perform scan
var job = new FileFormatScanJob(Scanners, firstBytes, lastBytes, stream);
var fingerprint = await job.ScanAsync();
return(fingerprint);
}
public static FileFormat Get(Stream stream)
{
// Get first 4K
stream.Seek(0, SeekOrigin.Begin);
var firstBytes = FileFormatUtils.ReadBytes(stream, FourKilobytes);
// Get last 4K
var lastBytes = firstBytes;
if (stream.Length > FourKilobytes)
{
var offset = stream.Length - FourKilobytes;
stream.Seek(offset, SeekOrigin.Begin);
lastBytes = FileFormatUtils.ReadBytes(stream, FourKilobytes);
}
// Perform scan
var job = new FileFormatScanJob(Scanners, firstBytes, lastBytes, stream);
var fingerprint = job.Scan();
return(fingerprint);
}